diff --git a/meeteval/wer/wer/time_constrained.py b/meeteval/wer/wer/time_constrained.py
index 7137de25..ecb0960d 100644
--- a/meeteval/wer/wer/time_constrained.py
+++ b/meeteval/wer/wer/time_constrained.py
@@ -367,7 +367,7 @@ def get_pseudo_word_level_timings(t: SegLST, strategy: str) -> SegLST:
         - `'none`' or `None`: Do not estimate word-level timings but assume
                 that the provided timings are already given on a word level.
 
-    >>> from IPython.lib.pretty import pprint
+    >>> from paderbox.utils.pretty import pprint
     >>> from meeteval.io.seglst import SegLST
     >>> s = SegLST([{'words': 'abc b', 'start_time': 0, 'end_time': 4}, {'words': 'c d e f', 'start_time': 4, 'end_time': 8}])
     >>> pprint(get_pseudo_word_level_timings(s, 'full_segment'))
@@ -499,18 +499,28 @@ def sort_and_validate(segments: SegLST, sort, pseudo_word_level_timing, name, wa
         pseudo_word_level_timing:
         name:
 
+    >>> from paderbox.utils.pretty import pprint
     >>> segments = SegLST([{'words': 'c d', 'start_time': 1, 'end_time': 3}, {'words': 'a b', 'start_time': 0, 'end_time': 3}])
     >>> sort_and_validate(segments, True, 'character_based', 'test')
     Traceback (most recent call last):
     ...
     ValueError: The order of word-level timings contradicts the segment-level order in test: 2 of 4 times.
     Consider setting sort to False or "segment" or "word".
-    >>> sort_and_validate(segments, False, 'character_based', 'test')
-    SegLST(segments=[{'words': 'c', 'start_time': 1.0, 'end_time': 2.0}, {'words': 'd', 'start_time': 2.0, 'end_time': 3.0}, {'words': 'a', 'start_time': 0.0, 'end_time': 1.5}, {'words': 'b', 'start_time': 1.5, 'end_time': 3.0}])
-    >>> sort_and_validate(segments, 'segment', 'character_based', 'test')
-    SegLST(segments=[{'words': 'a', 'start_time': 0.0, 'end_time': 1.5}, {'words': 'b', 'start_time': 1.5, 'end_time': 3.0}, {'words': 'c', 'start_time': 1.0, 'end_time': 2.0}, {'words': 'd', 'start_time': 2.0, 'end_time': 3.0}])
-    >>> sort_and_validate(segments, 'word', 'character_based', 'test')
-    SegLST(segments=[{'words': 'a', 'start_time': 0.0, 'end_time': 1.5}, {'words': 'c', 'start_time': 1.0, 'end_time': 2.0}, {'words': 'b', 'start_time': 1.5, 'end_time': 3.0}, {'words': 'd', 'start_time': 2.0, 'end_time': 3.0}])
+    >>> pprint(sort_and_validate(segments, False, 'character_based', 'test'))
+    SegLST([{'words': 'c', 'start_time': 1.0, 'end_time': 2.0},
+            {'words': 'd', 'start_time': 2.0, 'end_time': 3.0},
+            {'words': 'a', 'start_time': 0.0, 'end_time': 1.5},
+            {'words': 'b', 'start_time': 1.5, 'end_time': 3.0}])
+    >>> pprint(sort_and_validate(segments, 'segment', 'character_based', 'test'))
+    SegLST([{'words': 'a', 'start_time': 0.0, 'end_time': 1.5},
+            {'words': 'b', 'start_time': 1.5, 'end_time': 3.0},
+            {'words': 'c', 'start_time': 1.0, 'end_time': 2.0},
+            {'words': 'd', 'start_time': 2.0, 'end_time': 3.0}])
+    >>> pprint(sort_and_validate(segments, 'word', 'character_based', 'test'))
+    SegLST([{'words': 'a', 'start_time': 0.0, 'end_time': 1.5},
+            {'words': 'c', 'start_time': 1.0, 'end_time': 2.0},
+            {'words': 'b', 'start_time': 1.5, 'end_time': 3.0},
+            {'words': 'd', 'start_time': 2.0, 'end_time': 3.0}])
     """
     if sort not in (True, False, 'segment', 'word'):
         raise ValueError(
diff --git a/setup.py b/setup.py
index b8de181f..044638e4 100644
--- a/setup.py
+++ b/setup.py
@@ -50,7 +50,7 @@
     'hypothesis',
     'coverage',
     'pytest-cov',
-    'ipython',  # IPython.lib.pretty.pprint
+    'paderbox', # paderbox.utils.pretty.pprint
     *extras_require['cli'],
 ]
 extras_require['all'] = [
@@ -118,6 +118,7 @@
     packages=find_packages(exclude=['contrib', 'docs', 'tests*']),
     install_requires=[
         'kaldialign',
+        'numpy',
         'scipy',  # scipy.optimize.linear_sum_assignment
         "typing_extensions; python_version<'3.8'",  # Missing Literal in py37
         "cached_property; python_version<'3.8'",  # Missing functools.cached_property in py37